tacnode


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tacnode

(ˈtækˌnəʊd)
n
(Mathematics) another name for osculation1
[C19: from Latin tactus touch (from tangere to touch) + node]
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(2) {(x, y) [member of] ([R.sup.2], 0) | [x.sup.4] [+ or -] [y.sup.2] = 0} (tacnode or point); (Figure 6),
We have there a singularity which is a tacnode...".